63-72 Chevy Truck Hydroboost Kit. Hydroboost brakes are a great upgrade over manual or vacuum power brakes. These hydraulic assist brakes work off of your power steering pump and are more powerful and compact than a vacuum assist system. Hydroboost brakes work perfect with blown engines and engines with low vacuum. Kit includes the hydroboost, a polished Wilwood master cylinder, firewall mounting brackets and pedal rod